unstructured

9f3d994e - Remove pdfminer.six version constraint, bump dependencies to address high severity CVEs (#4156)

Remove pdfminer.six version constraint, bump dependencies to address high severity CVEs (#4156) <!-- CURSOR_SUMMARY --> > [!NOTE] > Security-focused dependency updates and alignment with new pdfminer behavior. > > - Remove `pdfminer.six` constraint; bump `pdfminer-six` to `20251230` and `urllib3` to `2.6.2` across requirement sets, plus assorted minor dependency bumps > - Update tests (`test_pdfminer_processing`) to reflect pdfminer’s hidden OCR text handling; add clarifying docstring in `text_is_embedded` > - Bump version to `0.18.25` and update `CHANGELOG.md` > > ^{Written by [Cursor Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit 04f70ee60d0eb7574fb79548fb9981949ccad207. This will update automatically on new commits. Configure [here](https://cursor.com/dashboard?tab=bugbot).} <!-- /CURSOR_SUMMARY --> --------- Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>